Chapter 9

Phases of the Moon and Constellation

Why the Moon appears to change shape over a month, and what a constellation is — with an interactive exercise.

The Moon seems to change shape over about a month. These shapes are the phases of the Moon.

The phases go new moon → crescent → half → full moon and back again. The Moon makes no light of its own — we see the part lit by the Sun. A constellation is a group of stars that makes a pattern in the sky.

Remember

  • Moon phases repeat in about a month.
  • The Moon reflects the Sun's light; a constellation is a star pattern.

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